Optical fiber grating inclination angle sensor

Abstract

It is a light fiber incline angle sensor, which comprises a wide band light source connected with light fiber coupler linkage, two 2x2 light fiber coupler, sensor probe, two photoelectricity detector and signal process unit connected with the photoelectricity detector. The technique characteristic in this invention is to adopt cantalever gravity structure and serial reflection light fiber grating sensor self-demodulation technique. Due to two same parameters light fiber grating stick on the cantalever and are sealed in the frame , it is to improve the usage life first and to reduce the environment temperature impact on measurement.

Description

technical field [0001] An optical fiber grating tilt angle sensor belongs to the technical field of optical fiber sensing and photoelectric detection. Background technique [0002] Traditional tilt angle measurement methods mainly include mechanical measurement, electromagnetic measurement and optical measurement. Among them, the degree of automation of the mechanical measurement method is low, and the electromagnetic measurement method has a weak anti-electromagnetic interference ability; in contrast, due to the advantages of fast speed, high precision and sensitivity, and anti-electromagnetic interference, the optical detection technology has been widely used in the field of tilt angle measurement. Favored by many research institutions and industries. For example [Fang Xiaoyong, Cao Maosheng, "Theoretical analysis of 2Dlaser angle sensor and several design parameters", Optics and Laser Technology, 34(3), 225-229(2002)], the incident light is divided into Several groups o...

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Problems solved by technology

[0003] At present, most of the methods of measuring tilt angle by optical method require complex structures and expensive instruments, and the measurement system has a large volume.

Hong Kong scholars [Bai-OuGuan, Hwa-Yaw Tam, Shun-Yee Liu, "Temperature-Independent Fiber Bragg Grating Tilt Sensor", IEEE Photonics Technology Letters, 16(1), 224-226(2004)] proposed a fiber-based Compared with the traditional laser measurement method, the tilt angle measurement method of the grating sensing principle has improved the structure complexity and cost, but this method still has the following technical problems and defects: ① The fiber grating is not attached to any carrier and Direct force is prone to breakage; ② no temperature compensation measures are used, making the system susceptible to ambient temperature; ③ the system needs to use an additional demodulation device to perform measurement, which increases the number of fiber gratings used, the volume and cost of the system ;④ Changes in the light intensity of the light source will affect the measurement results

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